package com.skillworld.webapp.web.pages.rest.school;

import org.apache.tapestry5.annotations.ContentType;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.annotations.SessionState;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

import com.skillworld.webapp.model.courseservice.CourseService;
import com.skillworld.webapp.model.courseservice.TutorialNotInLessonException;
import com.skillworld.webapp.model.util.PermissionDeniedException;
import com.skillworld.webapp.web.util.ErrorMessages;
import com.skillworld.webapp.web.util.UserSession;

import es.udc.pojo.modelutil.exceptions.InstanceNotFoundException;

@ContentType("text/xml")
public class RemoveTutorial {

	@SuppressWarnings("unused")
    @Property
    private String errorMessage = null;

    @Inject
    private CourseService courseService;

	@SessionState(create=false)
    private UserSession userSession;
   
    private boolean userSessionExists;
    
    @Inject
    private Request request;
    
    
    void onPassivate() 
    {
        return;
    }
	
    void onActivate()
    {       
        if (!userSessionExists)
        {
            errorMessage = ErrorMessages.NOT_LOGGED_IN;
            return;
        }
        
        String lessonParam = request.getParameter("lesson");
        String tutParam = request.getParameter("tut"); 
        
        if (lessonParam == null || tutParam == null)
        { 
            errorMessage = ErrorMessages.INVALID_ARGUMENTS;
            return;
        }
        
        try 
        {
            long lessonId = Long.parseLong(lessonParam);
            long tutorialId = Long.parseLong(tutParam);
            courseService.removeTutorial(userSession.getUserId(), lessonId, 
                                            tutorialId);
        }
        catch (InstanceNotFoundException e)
        { errorMessage = ErrorMessages.INSTANCE_NOT_FOUND; } 
        catch (PermissionDeniedException e)
        { errorMessage = ErrorMessages.PERMISSION_DENIED; }
        catch (TutorialNotInLessonException e)
        { errorMessage = ErrorMessages.TUTORIAL_NOT_IN_LESSON; }   
    } 
	
}
